anyone know how to switch back dag ip?

The dag has 2 ip addresses configured, one at each active directory site.
I shut down servers in the primary site. The dag ip then changed to the ip in the remote site subnet. I brought back online the servers in the primary site, but the dag ip did not change back to its original ip in the primary site subnet. All the mailbox databases are mounted fine, just I want to switch back the dag ip.

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Anand_N